Tinnitus is a condition in which a person hears a ringing, buzzing or hissing sound which is caused by the hearing system itself and not by any external sources.
Tinnitus can be temporary or persistent and is relatively widespread. It is often associated with hearing impairment, ageing or exposure to loud sounds, and generally involves the part of the nervous system that deals with hearing.
Source: GreenFacts, based on SCENIHR
Deutsch: Ohrensausen (Tinnitus)
Español: Tinnitus
Français: Acouphènes